Accounting Standards - Narratives (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 27, 2019	Jan. 26, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 69,065		$ 0
Operating lease liability related to long-term operating leases	$ 69,521
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 71,000
Operating lease liability related to long-term operating leases		$ 71,000